20560511 has 4 divisors (see below), whose sum is σ = 20808312. Its totient is φ = 20312712.

The previous prime is 20560487. The next prime is 20560517. The reversal of 20560511 is 11506502.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 20560511 - 2¹⁸ = 20298367 is a prime.

It is a super-2 number, since 2×20560511² = 845469225162242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20560517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 123776 + ... + 123941.

It is an arithmetic number, because the mean of its divisors is an integer number (5202078).

Almost surely, 2^20560511 is an apocalyptic number.

20560511 is a deficient number, since it is larger than the sum of its proper divisors (247801).

20560511 is an equidigital number, since it uses as much as digits as its factorization.

20560511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247800.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 20560511 is about 4534.3699672612. The cubic root of 20560511 is about 273.9542031900.

The spelling of 20560511 in words is "twenty million, five hundred sixty thousand, five hundred eleven".